This is not possible via a quick-filter. Unfortunately this text is not changeable. You can remove this button altogether, but you can't change it. My recommendation would be to leverage a parameter. Give the parameter (we'll call it Region Parameter):

Global

AmericasAPJCEMEAR

There are now 2 ways to leverage this parameter. For the first parameter (which is generally more flexible), you could do something similar to the following):

Then filter only on the True values. You can be a bit more eloquent with this calc and simplify it to the following:

[Region Parameter] = [Region] OR [Region Parameter] = "Global"

Then filter only for True values just like above.

The other method is to pick a measure if you are only trying to use this for a specific measure. This allows you to not filter a whole sheet, but filter only for a specific metric. We'll pretend in this instance you are trying to view Sales. To accomplish this, use the same calculations as above, but replace "True" with [Sales]. You also don't have to filter anything with this method, which makes 1 less step for anyone using this dataset later if they are unfamiliar with it.